Digital high-speed vortex mixing microplate shaker handles up to 4 microplates, (or up to 8 plates with the optional accessory tray). The combined speed and 1 mm orbit provide consistant well to well and plate to plate uniformity, even in 384-well plates. Featuring programable speed, time and continuous or pulse time, it's ideal for achieving accurate and repeatable results. The Pulse feature allows rapid pulsing or timed “on/off” mixing for interval mixing. Ideal for use in PCR Preparation, Digestions, Bead Mixing, ELISA, EIA, and Colorimetric Assay applications.